Cauldron Familiar, Kaya the Inexorable, and Worldfire

Prerequisites

• Cauldron Familiar on the battlefield
• Kaya the Inexorable on the battlefield
• Worldfire in hand
• available

Steps

1. Activate Kaya's first loyalty ability, putting a ghostform counter on Cauldron Familiar
2. Cast Worldfire, exiling all permanents, all cards in all hands and graveyards, and setting each player's life total to one
3. Cauldron Familiar triggers, returning itself from exile to your hand and creating a 1/1 Spirit creature token
4. Cast Cauldron Familiar
5. Cauldron Familiar enters the battlefield, losing each opponent 1 life and you to gain 1 life

Results

• Each opponent loses the game
• Exile all cards in all hands and graveyards
• Exile all permanents
• Near-infinite lifeloss